Method of and circuit arrangement for contrast correction in which a correction signal derived from the luminance signal is added to each color signal

A circuit arrangement for performing contrast correction on color television signals including three color signals (R, G, B), characterized in that said circuit arrangement comprises:

• a matrix having inputs for receiving the three color signals (R, G, B) and having an output for supplying a luminance signal (Y) derived from the three color signals;
• a circuit for deriving a correction signal, said circuit having an input for receiving the luminance signal, and an output for supplying the correction signal, said correction signal having a maximum value in proximity of a black level in the luminance signal, said correction signal becoming zero in a blanking interval and in proximity of a white level in the luminance signal;
• and
• three adder stages having respective first inputs coupled to the output of said circuit for deriving a correction signal, respective second inputs coupled to receive the three color signals (R, G, B), respectively, and respective outputs for supplying respective corrected color signals (R', G', B').